Holy Roman Empire UK /ˈhəʊli ˈɹəʊmən ˈɛmpaɪə/US /ˈhoʊli ˈɹoʊmən ˈɛmpaɪɚ/ noun1 •(historical) A former polity and medieval empire forming a loose conglomeration of largely independent mostly Germanic entities in Central Europe from at least 962 C.E. until 1806.